Protective sheath for structural components

ABSTRACT

A method to dissipate heat build-up in a structural component is disclosed. In one embodiment, the structural component is a composite pipe for carrying a hot fluid, e.g., petroleum products. The method comprises providing a protective sheath disposed around the structural component and forming an air space between the structural component and the sheath. The sheath has at least two gaps on its surface, with the gaps being sufficiently spaced apart to allow air flowing through the air space from one gap to another to dissipate heat build-up from the hot fluid contained within the structural component. In one embodiment, an intumescent material is applied near the gaps, which material expands when heated to a temperature in a fire to effectively close the gaps and protect the structural component from the fire.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit under 35 USC 119 of U.S. ProvisionalPatent Application No. 61/503,623 with a filing date of Jul. 1, 2011.This application claims priority to and benefits from the foregoing, thedisclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The invention relates to a protective sheath for structural componentssuch as vessels, equipment, piping systems, etc., and methods forproviding protection for and/or heat dissipation in a structuralcomponent.

BACKGROUND

Structural components such as vessels, piping or tubing for carryingfluids such as petroleum products may require protection from firedamage depending on the fluid contained, the material of construction,and the location of the equipment. Conduit for use in containinginstrumentation and electrical wirings may also need similar fireprotection.

In the prior art, the usual approach for fire protection is to installinsulation materials, e.g., polyurethane foam, intumescent coatings,fiberglass, calcium silicate insulation, etc., around the pipe orequipment. Application of an insulative fire-protection layer would helpin the event of a fire with the side effect of heat retention within theequipment or piping, which can be beneficial if the intent is to keepthe process fluid hot. Composite wrappings, e.g., non-yellowingfiberglass tapes pre-impregnated with a resin, have been used to provideUV protection for equipment and pipes. However, heat retention can beundesirable with the prior art approach, particularly for certainprocess equipment and under certain operating conditions, e.g., the useof composite materials for carrying process fluids such as petroleumproducts at high temperatures.

There is a need for an improved design and associated methods to provideprotection for structural components from fire exposure, mechanicalimpact, vibration abrasion, fire exposure, heat damage, ultravioletlight, etc.

SUMMARY

In one aspect, the invention relates to a method to dissipate heatbuild-up in a structural component carrying a hot fluid. The methodcomprises: providing at least a structural component for containing thehot fluid, the structural component having an outer surface area;providing a protective sheath disposed around the structural component,creating an air space between the outer surface area of the structuralcomponent and the protective sheath, the non-insulating protectivesheath having at least two openings, a first opening near or at a bottomside of the sheath and a second opening near or at a top side of thesheath; and dissipating heat build-up by creating a chimney effect fromair drawn in through the first opening, passing through the air spaceover the structural component and exiting out the second opening

In another aspect, the invention relates to a system for carrying a hotfluid, the system comprising: at least a structural component forcontaining the hot fluid; a protective sheath disposed around thestructural component, forming an air space between the structuralcomponent and the protective sheath, the protective sheath having atleast two gaps including a first gap and a second gap; wherein the gapsare sufficiently spaced apart to allow air flowing into the first gapthrough the air space and out of the second gap to dissipate heat fromthe hot fluid contained within the structural component.

In another aspect, the invention relates to a composite pipe system forcarrying petroleum products, the pipe system comprising: at least acomposite pipe for carrying the petroleum products; a protective sheathdisposed around the composite pipe, forming an air space between thecomposite pipe and the protective sheath, the protective sheathcomprising at least two half-pipe sections, and wherein each half-pipesection has two opposite seams each shaped at an angle such that theshaped seams from the two half-pipe sections in abutting position definea first gap and a second gap running longitudinally along full length ofthe protective sheath; intumescent adhesive material applied ontoopposing sides of the shaped seams. In the pipe system, air flows intothe first gap passes through the air space and out of the second gap todissipate heat built-up. Furthermore, in a fire when the intumescentmaterial is heated to an elevated temperature between 300 to 1200° F.,the material fully expands to effectively close the gaps and protect thecomposite pipe from the fire.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of a pipe section including an embodimentof the protective sheath.

FIG. 2 is a cross-section view of the pipe section of FIG. 1.

FIG. 3 is a perspective view of a pipe section in a second embodiment ofa protective sheath.

FIG. 4 is a cross-section view of the pipe section of FIG. 3.

FIG. 5 is a perspective view of a third embodiment of a protectivesheath prior to assembly.

FIG. 6 is another perspective view of the protective sheath of FIG. 5after it is assembled to be used on a pipe section.

DETAILED DESCRIPTION

The following terms will be used throughout the specification and willhave the following meanings unless otherwise indicated.

“Petroleum products” refer to natural gas; natural and synthetic liquidhydrocarbon products including but not limited to biodegraded oils,crude oils, refined products including gasoline, other fuels, andsolvents; and semi-solid/solid hydrocarbon products including but notlimited to tar sand, bitumen, etc.

“Structural components” refer to containers, supporting members,structural supports, tubings, pipelines, pipe systems, vessels,reactors, transfer lines, process piping, processing equipment includingbut not limited to distillation columns, and the like for commerceincluding but not limited to chemical, petrochemical, and oil & gasindustries. In one embodiment, the structural component is a section ofpipe for transporting petroleum products.

“Contain” (or containing, or containment) means being used in anenvironment wherein process fluids are employed, or being in contactwith process fluids such as petroleum products, which includes thetransport, processing, handling, storage, shipping, and containment ofprocess fluids, whether on a continuous, incidental, or intermittentbasis.

“Thickness” refers to the average thickness of a layer.

“Composite” material refers to an engineered material made from two ormore constituent materials with different physical or chemicalproperties and which remain separate and distinct on a macroscopic levelwithin the finished structure. In one embodiment, the composite layercomprises a fiber material in a matrix, e.g., a fiber-reinforced plasticcomposite material, a fiber reinforced resin, glass-reinforced plasticor GRP, a fiber-reinforced ceramic matrix composite material, a metalmatrix composite with a reinforcing fiber in a metal matrix, a glassfiber material in a glass ceramic composite, etc. Composite materialcomprising glass fiber in a plastic or ceramic matrix typically has avery low thermal conductivity compared to that of metals, e.g.,fiberglass has a thermal conductivity of 2 BTU//ft²-hr-° F.-in vs. avalue of 320 BTU//ft²-hr-° F.-in for steel.

A reference to “intumescent” or “intumescent material” is by want ofexemplification of a material which upon heating to a temperatureranging from about 300 to 1200° F., expands to a dimension (e.g.,thickness) that is at least 3 times the original dimension, which can beapplied as a coating, a pad, an adhesive, a layer, or a sealant. In oneembodiment, the material expands to 5-15 times its original volume. Theintumescent material may comprise compositions with intumescentcharacteristics, e.g., graphite, sodium silicate, vermiculite, or blendsthereof, or a blend of intumescent composition in other materials suchas non-combustible fibrous materials or elastomeric materials.

A reference to “pipe,” “pipe system,” or “piping system” is by way ofexemplification of a structural component, and not intended to excludeother equipment, equipment sections, in other forms or shapes such asvessels, or piping components and fittings such as elbows, tees,reducers, etc.

A reference to “hot” as in a hot process fluid means the fluid is at atemperature greater than ambient.

“Air space” refers to the space opening between the protective sheathand the equipment protected by the sheath. “Gap” (or “opening”) refersto an opening formed on the surface of the protective sheath, or anopening on the surface of the protective sheath (“side opening” or “sidehole”).

One concern about structural components for containing or carrying hotprocess fluids such as petroleum products at high temperatures is thedissipation of heat due to the low thermal conductivity of compositematerials. In composite pipe systems with the use of insulativematerials for fire protection, heat does not dissipate but rather buildsup over time. In one embodiment, the invention relates to a protectivesheath that provides fire protection for the underlying equipment, whileallowing heat dissipation or ventilation from the outer surface of theequipment under normal operating conditions. In another embodiment, theinvention relates to a protective sheath that provides heat dissipationor ventilation from a chimney effect. The underlying equipment can beconstructed from composite or metallic materials, and the protectivesheath can be constructed from metallic or non-metallic materials.

In one embodiment, the protective sheath is installed for the protectionof the equipment prior to a fire event. It can be installed on theequipment after the system is in place, i.e., after all the equipmentpieces are installed and connected together, or it can be installed as acomponent of the equipment to be installed.

The protective sheath can be of any shape or form, preferably in a shapeconforming to the equipment being protected, e.g., a curved sheath forthe protection of pipelines, as long as an air space or spacing isprovided between the outer surface of the equipment and the protectivesheath. The air space in-between the protective sheath and the equipmenthas an average thickness of at least ⅛″ in one embodiment, at least ¼″in a second embodiment, and at least 2″ in a third embodiment. Thedimension of the air space depends on a number of factors, including butnot limited to the dimensions of the equipment being protected, theproperties of the fluid being contained, the process conditions, e.g.,amount of heat expected to be generated by the process fluid,environment factors such as climate condition, sun exposure anddirection.

The protective sheath in one embodiment comprises a plurality of pieceswhen put together, slightly larger than the equipment to provide an airspace (gap) and conforming to the shape of the equipment, e.g., two halfpipe shaped sheath sections for protecting a pipe section with eachsheath section having an inside diameter sufficient larger than theoutside diameter of the pipe to create an air gap of at least ⅛″ betweenthe sheath and the pipe. The number of pieces/sections forming theprotective sheath depends on the size of the equipment to be covered,the material of construction for the sheath, the location of theequipment, whether the sheath is for an existing installation, amongother factors. In one embodiment for the protection of a small piece ofequipment or pipe, or with the use of sufficiently flexible material forthe protective sheath, the sheath can be a single piece. An installercan pull or spread the opposite seams of the sheath apart, allowing thesheath to be slipped over the equipment piece to be protected.

In one embodiment, the sheath sections are structured such that afterinstallation, a gap of at least ⅛″ is formed along a length of thesheath (and the equipment such as a pipe), allowing for the free flow ofair around the protected equipment. In a second embodiment, the gap isat least ¼″. In one embodiment with the use of two half sections forminga protective sheath, the sheath has two gaps positioned on oppositesides and running longitudinally along the length of the sheaths.

In one embodiment, the gap is formed by positioning two seams (edges) oftwo sheath sections (or opposite seams of an open-pipe shaped section)in an overlapping relationship and leaving a space between the twooverlapped seams to form the gap. In yet another embodiment, the gap isformed by bending or shaping the seam at an angle to the contour or thebody of the sheath, e.g., 90°, such that two seams in adjacent (e.g.,abutting) define an opening in-between the adjacent seams forming thegap. The gap in-between the seams can be kept open with the use ofappropriate spacers, retaining clips, bolts, etc., holding the seamstogether to retain the sheath in place while still leaving a gap forheat dissipation/air ventilation. In one embodiment, opposing seams ofthe sheath are fastened together with the use of bolts/nuts, withspacers being used for keeping the gap open. In yet another embodiment,the sheath is provided with a plurality of spaced-apart fingers (e.g.,projections or tabs) on one seam, with the seam on the opposite sidebeing provided with a plurality of corresponding spaced openings. Oncethe fingers pass through the openings, the fingers are bent back forminginterlocks that secure the sheath around the equipment.

In one embodiment, the gap runs at least a portion of the length of theprotective sheath. In another embodiment, the gap at least one half thelength of the protective sheath. In yet another embodiment, the gap isbetween ⅛″ to 1″ in width and runs the entire length of the protectivesheath. In one embodiment, instead of or in addition to gap(s) formed inbetween the seams of the sheath section(s), the sheath is provided witha plurality of side openings for air flow around the protectedequipment. In one embodiment, the side openings are in the form of slitspositioned along the length of the protective sheath.

In one embodiment for fire protection, the area adjacent to the gap,e.g., the seam areas defining the gaps or the side openings, is coatedwith an intumescent material. In yet another embodiment, the insidesurface area of the protective sheath is coated with an intumescentlayer. The intumescent material expands to its effective thermaldimension (e.g., thickness) when exposed to high temperatures,effectively closing the gap or the side openings and block radiant heat.An “effective” thermal dimension is a dimension which the intumescentmaterial fully expands when heated, e.g., from 300° F. to 1200° F. Theeffective dimension ranges at least 3 to 15 of the initial dimension ofthe intumescent material prior to heat exposure. In another embodiment,an intumescent adhesive pad is applied onto the seam areas defining thegaps or the side openings. In yet another embodiment, moldableintumescent sealant (or putty) is applied onto the seam areas of thegaps or the side openings.

With the application of intumescent pads for fire protection, the gapremains open during normal operating conditions and closed in a fire dueto the expansion of the intumescent coating (or pad). If there is a firefrom the equipment containing process fluids, surrounding structure maycatch on fire if an intense heat were to spread from equipment without aprotective sheath that would close up in a fire. Conversely, in theevent of a fire from the outside of the equipment, it may be desirableto fire protect the equipment with the sheath to help prevent fire fromreaching inside. In such a fire event, the system temperature increasesas the result, but the protective sheath is expected to provide theequipment and the fluid contained within protection from both radiationand convective heat transfer.

In embodiments for fire protection, the intumescent material can bepre-applied prior to installation of the sheath on the equipment, orapplied after installation after the sheath on the equipment. Theintumescent material is applied such that the gap substantially closesor filled with the expanded intumescent material. Those skilled in theart may modify how the intumescent material is applied on the seamsforming the gap, for example, a checkerboard application may be used sothat in a fire, the intumescent material expands in all dimensionsclosing the gaps between pieces of intumescent pads as well as the gapsbetween the overlapping seams of adjacent sheaths, or adjacent sheathsections.

In one embodiment, intumescent coatings (or pads) are applied onto allseam areas to ensure that all gaps are closed in the event of a fire. Inanother embodiment, intumescent materials are selectively applied tosome gaps only, e.g., the gap at the bottom (base) and not the gap atthe top of the protective sheath for an overhead pipe system. Theclosure of the bottom gap protects the equipment from fire encroachmentthat may be spread from equipment and surround areas underneath the pipesystem. In yet another embodiment where UV protection/heat dissipationis a priority instead of fire protection, the gaps are left open withoutany intumescent application.

In one embodiment, a plurality of spacers are positioned in-between thesheath and the outer surface of the pipe to be protected. The spacerscan be constructed out of wood, plastic, metal, adhesive material,intumescent material, etc. The spacers can be constructed as an integralpart of the sheath or as extra pieces to be applied between the sheathand the equipment. The spacers can be randomly spaced, or they can bepositioned in locations that would provide rigidity to the sheath, meansto attach the sheath to the equipment being protected within and/or themost structural support for the sheath, defining the amount of desiredair space in between the sheath and the equipment being protected.

In one embodiment for the protection of pipelines, where a sectionpipeline intersects with thoroughfare, the gaps are positioned half-wayon the curvature of the sheath cover of the pipe to allow aircirculation without fluid leakage to the thoroughfare below. In thisembodiment, a drainage pipe is optionally provided for connection to thesheath, allowing the draining of any rainwater or process fluid to theground. In another embodiment, at least one of the gaps is positioned atthe bottom of the sheath curvature to allow for the free draining ofrainwater or process fluid should the pipe leak.

In one embodiment for the general protection of structural componentssuch as vessels and the like with a non-insulating protective sheathwith an air space between the equipment and the protective sheath, airflow inlets are formed via the gaps (and/or side holes) in bottom areaof the protective sheath. Heat is dissipated from (or prevented frombeing entrapped in) the equipment via a chimney effect. The protectivesheath draws air in through the air flow inlets, e.g., gaps located atthe base or bottom of the sheath. The air flow is passed over theprotected equipment heated by convection. In the process, the air isheated such that it rises and exits out through the outlet(s) formed inthe gaps (and/or side holes) near or at the top of the sheath/equipmentbeing protected. As opposed to prior art embodiments that entrap heat,heat is effectively dissipated with the chimney effect created in theprotective sheath, i.e., the pulling-in and directing of air flowthrough the gaps or side holes in the sheath. Therefore with theprotective sheath, the temperature on the skin (outer surface) of theequipment carrying a hot process fluid remains considerably lower thanthat of the process fluid. Depending on the temperature of the processfluid as well as the prevailing ambient temperature, in one embodimentthe temperature on the outer surface of the equipment is between 5 to30° C. above the prevailing ambient temperature. Besides providing heatdissipating protection, in one embodiment, the protective sheath alsoprovides UV/rigidity protection for equipment, prolonging the life ofthe equipment.

The protective sheath in one embodiment is made out of metallic sheetmaterial such as stainless steel or carbon steel for fire protection. Inother embodiments, e.g., for heat dissipation, UV resistance protection,shading, mechanical protection, rigidity enforcement, etc., theprotective sheath can be constructed out of non-metallic materials suchas plastics and the like. The protective sheath may be formed of manypieces attached together in a longitudinal direction (for a pipe system)or in other manners such that there are extending or overlapping seamsbetween each piece, providing a protective sheath for the entire system.The different sheath sections can be constructed out of the same ordifferent materials, depending on the particular piece of equipment insystem to be protected, e.g., its location, the process fluid beingcontained or transported in the particular piece of equipment in thesystem, its location, etc. The sheath sections can be attached to oneanother or secured to the underlying equipment and/or supportingstructure using straps, pins, etc. or other securing mechanisms known inthe art. In one embodiment after a fire and depending on the extent ofthe damage, the sheath can be replaced and/or recoated with newintumescent coating or pads at the gap area. The sheath can also beremoved from one piece of equipment and retrofit for installation onanother piece of equipment.

In one embodiment, a protective sheet made out of stainless steel isemployed to provide fire protection for a composite pipe system,particular a pipe system for containing flammable fluids such aspetroleum products. A loss of containment in any portion of the pipingsystem may result in a high temperature, high heat flux, high velocityflame, or a jet fire. In a jet fire, the temperature of the fireincreases continuously and can be at 900° C. after 60 minutes, about1050° C. after 120 minutes, and up to 1150° C. after 240 minutes. Withthe opening gaps in the fire protective sheath quickly close up in afire, the composite pipe system is characterized as meeting level IIfire endurance standard according to the test method specified in theInternational Maritime Association (IMO A753, adopted Nov. 4, 1993),i.e., the pipe can endure a fully developed a hydrocarbon fire for along duration without loss of integrity under dry conditions. In oneembodiment, it takes at least 45 minutes before the inside diameter ofthe composite pipe in a system with the fire protective stainless sheathto reach 190° C. under the conditions of the IMO A753 test.

Figures Illustrating Embodiments

Reference will be made to the figures to further illustrate embodimentsof the invention. The figures illustrate the invention by way of exampleand not by way of limitation, such as limiting the equipment and shapesto sections of pipes as illustrated, or to the exact fasteningarrangements as illustrated.

FIG. 1 is a perspective view of a pipe section 30 including anembodiment of a protective sheath. The protective sheath comprises twoseparate sections 10 and 20 each with seams 11 and 21 respectively,overlapping forming the air space 15. Facing surfaces of the seams arelined with intumescent pads 11 and 22, which under heated conditionswill expand to completely close the air space 15. Although not shown,the sheath includes retaining clips to secure and/or maintain the seamsin position, keeping the air space 15 open for air ventilation. In oneembodiment (not shown), the protective sheath is provided with one stripof intumescent pad for lining one seam only. In another embodiment (notshown), the strip is lined on a seam on an intermittent and notcontinuous basis.

FIG. 2 is a cross-section view of the pipe section of FIG. 1, furthershowing spacers 14 and 24 which provides structural support for theprotective sheath as it is installed over the pipe section 30. In oneembodiment, the spacers can be employed to prop the seams separatekeeping the air space 15 open for ventilation.

FIG. 3 is a perspective view of a pipe section in a second embodiment ofa fire-protective sheath. In this embodiment, the seams 11 and 21 arebent at a 90° angle with respect to the curvature of the sheath sections10 and 20, leaving an open gap 15 for air ventilation. The facingsurfaces of bent sections 11 and 12 are lined with intumescent pads 11and 12. The sheath includes threaded bolts 23 (or retaining clips notshown) to maintain an open air space 15. In one embodiment (not shown),only one seam is lined with an intumescent pad on a continuous orintermittent basis.

FIG. 4 is a cross-section view of the pipe section of FIG. 3, furthershowing spacers 14 and 24 which provides structural support for theprotective sheath.

FIG. 5 is a perspective view of another embodiment of a protectivesheath 10 as a single section, provided with a number of tabs 11 on oneseam and corresponding holes 21 on the opposite seam. The holes 21 areoptionally provided with intumescent pads 22 partially covering theholes, while still leaving sufficient opening for the tabs to passthrough. In one embodiment as shown, intumescent pads 12 are provided onsome of the projection tabs. Also as shown, the sheath is provided withan air space or slit 15, which is provided with a plurality of spacedapart intumescent adhesive pads 16. In the event of a fire, theintumescent pads expand to cover the holes 21 as well as the slit 15.

FIG. 6 is a perspective view of the protective sheath in FIG. 5 afterassembly. As shown, after the tabs pass through the spaced apart holes21, the fingers 11 are bent back forming interlocks that secure thesheath around the equipment.

For the purposes of this specification and appended claims, unlessotherwise indicated, all numbers expressing quantities, percentages orproportions, and other numerical values used in the specification andclaims, are to be understood as being modified in all instances by theterm “about.” Accordingly, unless indicated to the contrary, thenumerical parameters set forth in the following specification andattached claims are approximations that may vary depending upon thedesired properties sought to be obtained by the present invention. It isnoted that, as used in this specification and the appended claims, thesingular forms “a,” “an,” and “the,” include plural references unlessexpressly and unequivocally limited to one referent. As used herein, theterm “include” and its grammatical variants are intended to benon-limiting, such that recitation of items in a list is not to theexclusion of other like items that can be substituted or added to thelisted items.

This written description uses examples to disclose the invention,including the best mode, and also to enable any person skilled in theart to make and use the invention. The patentable scope is defined bythe claims, and may include other examples that occur to those skilledin the art. Such other examples are intended to be within the scope ofthe claims if they have structural elements that do not differ from theliteral language of the claims, or if they include equivalent structuralelements with insubstantial differences from the literal languages ofthe claims. All citations referred herein are expressly incorporatedherein by reference.

1. A method to dissipate heat build-up in a structural componentcarrying a petroleum product, the method comprising: providing astructural component for containing the petroleum product, thestructural component having an outer surface area; providing aprotective sheath disposed around the structural component to create anair space of at least ⅛″ between the outer surface area of thestructural component and the protective sheath, the protective sheathhaving at least two openings, a first opening near or at a bottom sideof the structural component and a second opening near or at a top sideof the structural component; and dissipating heat build-up in thestructural component with a chimney effect from air drawn in through thefirst opening of the protective sheath, passing through the air spaceover the structural component and exiting out the second opening of theprotective sheath.
 2. The method of claim 1, wherein the structuralcomponent is a composite pipe.
 3. The method of claim 2, wherein theprotective sheath around the composite pipe creates an air space of atleast ½″ thickness between the protective sheath and the composite pipe.4. The method of claim 1, wherein at least one of the first opening andthe second opening is at least ⅛″ wide and runs at least one half thelength of the protective sheath.
 5. The method of claim 1, furthercomprising: placing a plurality of spacers in between the protectivesheath and the structural component.
 6. The method of claim 1, whereinproviding the protective sheath is constructed of metallic sheetmaterial.
 7. The method of claim 1, wherein the protective sheathcomprises at least two opposing seams each shaped at an angle such thatthe opposing shaped seams in an adjacent position defines an open spaceforming at least one of the openings.
 8. The method of claim 1, whereinthe protective sheath comprises at least two opposing seams, a firstseam and a second seam, with the first seam comprising a plurality ofspaced-apart tabs and the second seam comprising a plurality ofcorresponding spaced slots, and wherein the spaced apart tabs areconfigured to be extended through the spaced slots and bent back tosecure the protective sheath around the structural component.
 9. Themethod of claim 1, wherein the protective sheath comprises at least twoopposite seams, wherein the opposite seams overlap forming at least oneof the first opening and the second opening.
 10. The method of claim 1,further comprising: applying a sufficient amount of intumescent materialin an area adjacent to at least one of the openings for the intumescentmaterial to expand when heated to a temperature between 300 to 1200° F.to effectively close the at least one of the openings.
 11. The method ofclaim 1, wherein the intumescent material is selected from an adhesive,a sealant, and a putty.
 12. A method to dissipate heat build-up in acomposite pipe carrying a petroleum product, the method comprising:providing two half-pipe sections conforming to the composite pipe, eachsection having two opposite seams shaped at an angle; disposing the halfpipe sections around the composite pipe with the opposite shaped seamsin adjacent position define a first gap and a second gap runninglongitudinally along the composite pipe; fastening the half-pipesections at the opposite shaped seams to form a protective sheathdisposed around the composite pipe defining an air space between thecomposite pipe and the protective sheath; dissipating the heat build-upin the composite pipe with a chimney effect from air drawn in throughthe first gap and passing through the air space over the composite pipeand exiting out the second gap.
 13. The method of claim 12, furthercomprising placing a plurality of spacers in between the protectivesheath and the composite pipe.
 14. The method of claim 12, furthercomprising applying an intumescent material onto at least one oppositeshaped seam defining the first gap and at least one opposite shaped seamdefining the second gap;
 15. The method of claim 14, wherein theintumescent material is selected from an adhesive, a sealant, and aputty.
 16. The method of claim 12, wherein the two half-pipe sectionsare constructed of a metallic sheet material.
 17. A method to providefire protection for a composite pipe carrying a petroleum product, themethod comprising: providing two half-pipe sections conforming to thecomposite pipe, each section having two opposite seams shaped at anangle; disposing the half pipe sections around the composite pipe withthe opposite shaped seams in adjacent position define a first gap and asecond gap running laterally to the composite pipe; applying anintumescent material onto at least one opposite shaped seam defining thefirst gap and at least one opposite shaped seam defining the second gap;fastening the half-pipe sections at the opposite shaped seams to form aprotective sheath disposed around the composite pipe and define an airspace of at least ⅛″ between the composite pipe and the protectivesheath; wherein the intumescent material expands when heated to atemperature in a fire at an elevated temperature between 300 to 1200° F.to effectively close the gaps and protect the composite pipe from thefire.
 18. The method of claim 1, wherein at least one of the first gapand the second gap is at least ⅛″ wide.
 19. The method of claim 17,wherein the air space between the protective sheath and the structuralcomponent is at least ½″.
 20. The method of claim 16, wherein theintumescent material has an effective thermal dimension of at least 3 to15 of initial dimension prior to being heated in a fire.
 21. The methodof claim 17, wherein the intumescent material is selected from anadhesive, a sealant, and a putty.